Edouard martin



No. 625,1!7. Patented May l6, I899.

E. MARTIN.

MANUFACTURE OF COMPOUND PLATES. A lication 211m Feb. 24, 1898.)

n x TERS cu, Pncrrouma, WASHINGTON n c NrrEn STATES PATENT ()FFICE.

EDOUARD MARTIN, OF PARIS, FRANCE.

MANUFACTURE OF COMPOUND PLATEYS.

$PECIFICATION forming part Of Letters Batent No. 625,117, dated May 16,1899.

Application filed February 24, 1898 Serial Ito-671,503. specimens.)

T0 (4% whom it may 00720677714;

Be it known that I, EDOUARD MARTIN,a citizen of France, residing at 46Rue de Dunkerque, Paris, France, have invented a certain new and usefulManufacture of a Compound Metal of Steel and Silver, of which thefollowing is a specification.

In the accompanying drawings, Figure 1 is a cross-section showing thesteel plates and copper sheets I employ, and Fig. 2 is a similar viewshowing also the interposed silver sheets with their separating steelsheet.

This invention relates to the manufacture of a compound metal consistingof sheets or plates of steel and silver firmly united'together.

It has not been practicable hitherto to producea compound metal composedof sheets or plates of steel and silver so effectually united as toallow of its being bent or otherwise treated for the manufacture ofarticles therefrom without deterioration orsepara'tion of plates'arepickled and cleaned, so as to avoid the two metals. By my presentinvention I am enabled to produce a compound metal composed of steel andsilver which possesses the above-described properties. for this purposeas follows: I take bars, plates, or ingots of steel of any desireddimensions, preferably about two hundred millimeters wide by six hundred millimeters long and from fifty to one hundred millimeters thick.These all impurities and imperfections on the surfaces which are toreceive the preparation. Upon these plates I either deposit a thin layerof copper by electrolysis, or by hydraulic pressure I apply athin foilof perfectly pure cop- .per. In the case of galvanic deposit I deposit,

either after or before the copper coating, a thin layer of zinc or tin,either on the steel or on the copper. When this has been effected, Iheat the bar, plate, or ingot to a cherry-red heat, and after placing itbetween two steel plates having very polished surfaces I subject it tostrong hydraulic pressure. This operation has for its objecttoincorporate the copper and zinc or tin or the copper alone with thesteel in order that in the following operation there may be no oxidationof the steel and that the united metals may when fused form a perfectlysoldered or brazed union. When operating by hydraulic pressure, the

I proceed cleansed steel bars have an electrolytic deposit of zinc ortin formed upon them. I prepare an exceedingly thin foil of copper orbronze and place it on the steel plate, bar, or ingot. Upon a secondprepared steel bar I place another thin. foil of copper or bronze, and Ithen place the two bars upon each other with their copper or bronzefoils in contact, these having been previously coated with flake-whitein order to prevent them from uniting, and I tie the bars firmlytogether in order to prevent any displacement of the foils. Fig. 1 showsthe two prepared steel plates or bars a 0L with theirsheets of copperbb. After heating these combined bars, plates, or ingots to a red heat Isubject them to strong pressure in a hydraulic press. By this means Iobtain steel plates, bars, or ingots one side of which is adapted toreceive a sheet of silver without oxidation. The above operation mayalso be effected by hot-rolling. The plates, &c.,'are then pickled andcleaned and have a sheet of silver applied thereto. This may either beof pure silver or it may be alloyed with other metals for strengheningit, such as aluminium, copper, tin, zinc, but preferprepared I place asecond bar similarly probars to considerable pressure in a hydraulicpress, after which I allow them to cool. When employing a rolling millinstead of a hydraulic press for exerting the requisite pressure, I onlytake two bars,with the silver plates situated between them, so as to beprotected against the very high temperature to which the steel requiresto be raised for the hot-rolling operation, the heat being regulated soas to be just below the melting-point of the silver. When the packets oftwo bars have attained this temperature, they are passed through closedgrooves of a rollingmill exerting strong pressurethereon, whereby thesilver sheets will become firmly united tothe prepared surfaces of thesteel bars, and I thus obtain the compound bar of steel and silver abovedescribed. The bars thus obtained are then heated and rolled out to anydesired size and thickness. The steel bars, plates, or ingots may alsobe provided with a second sheet of silver on the opposite side.

Compound bars, plates, or ingots produced according to myabove-describedinvention can be used for a great variety of objects or utensils forhousehold or other purposes such as for milk-cans, sardine-boxes,preserve-cases, cooking vessels, gridirons, molds, spoons, forks,basins, plates, &c.'-also for articles used for military and navalpurposessuch as flasks, pannikins, elevated quadrants for guns,armor-plates, &c.

Having thus described the nature of this invention and the best means Iknow for carrying the same into practical effect, I claim 1. The methodof making compound metal of steel and silver, consisting in coating twosteel plates with a metal other than silver, placing the two platestogether with their coated surfaces in contact,subj ectin g the packthus formed to heat and pressure, separating the plates, applying sheetsof silver to the coated faces, again forming a packet of the two sheetswith the silver sheets innermost, and again subjecting the packet toheat and pressure; substantially as described.

2. The process of making compound metal of steel and silver, whichconsists in applying copper sheets to two metal plates, placing theplates together with the copper sheets in contact, subjecting the packetthus formed to heat and pressure, separating the copper-coated steelplates, applying sheets of silver to the copper-coated faces, forming apacket of the same with the silver sheets innermost, and separated by asheet of steel, and then subjecting the packet thus formed to heat andpressure; substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses,

EDOUARD MARTIN.

Witnesses:

ANTONUS GANTCHER, CELEsTUs LAMBERT.

